I experienced the same problem. It says "An unknown error has occurred." I have uninstalled and reinstalled the most updated version of the app but still not let me sign in. Please see the screenshot of the error.
Please help as I need to use my tracking app to work for my client.
**Edited for Community Guidelines**
I'm also having issue with logging in to several devices. "Due to technical difficulties we are unable to process your request. Please try again later."
Tried the troublehsooting steps but it didn't work.
Hope someone can help.